I want to add a variable into mysql in nodejs - mysql

Question

I insert a record in the database like this
connection.connect(function(err) {
if (err) throw err;
console.log("Connected!");
var sql = "INSERT INTO xtable (x_date, x_time, x_text) VALUES ('2018-05-26', '23:00:00', 'blablabla')";
connection.query(sql, function (err, result) {
if (err) throw err;
console.log("1 record inserted");
connection.end();
});
});
The above works but lets say I do
var ytime = '19:00:00';
var ydate = '2018-05-29';
var ytext = 'blabla';
connection.connect(function(err) {
if (err) throw err;
console.log("Connected!");
var sql = "INSERT INTO xtable (x_date, x_time, x_text) VALUES (ydate, ytime, ytext)";
connection.query(sql, function (err, result) {
if (err) throw err;
console.log("1 record inserted");
connection.end();
});
});
How do I do that? this gives just errors my node is v8.10.0

Answer 1

The latter didn't work because the sql statement did not interpret your ydate,ytime,ytext as variables but as a part of string. If you want to separate the statement and your data, you should do like this:
var ytime = '19:00:00';
var ydate = '2018-05-29';
var ytext = 'blabla';
var sql = "INSERT INTO xtable (x_date, x_time, x_text) VALUES (?,?,?)";
connection.query(sql, [ydate,ytime, ytext], function(err,result) {
...
});

Answer 2

You just switch your data to use placeholder values, then add the data separately:
connection.query(
"INSERT INTO xtable (x_date, x_time, x_text) VALUES (?, ?, ?)",
[ ydate, ytime, ytext ],
function (err, result) {
// ...
}
}
One thing to note about Node and MySQL is there's tools like Sequelize that make this a lot easier. Anything that supports Promises and async/await is almost always less fuss than a series of nested callbacks.